Pneumatic motor.



fc'. FREBORG.

PNEUMATIC MOTOR.

APPLICATION FILED NOV- 181 I913.

, 1,183,862. Patented May23, 1916.

2 SHEETS-SHEET I.

I 'Czarzwflea C. FREBORG.

PNEUMATIC MOTOR.

' LED NOV 19 1,183,862. 7 I Paten ted May 23,1916.

llllililll mm r)! ,1 II III! II I I'll UNITED STATfi IEEENT onmcn.

CHARLES FREBORG, OF KANKAKEE, ILLINOIS, ASSIGNOR TO PRICE AND TEEPLEPIANO COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF- ILLINOIS. I

PNEUMATIC, MOTOR.

application filed November 18, 1913. Serial No. 801,608.

To all whom it may concern:

Be it known that I, CHARLES FREBoRe, a

citizen of the United States, residing at Kankakee, in the countyofKankakee and State of Illinois, have invented certa n new and usefulImprovements in Pneumatic Motors, of which the following is aspecification.

The principal object of my invention is to provide anew and improvedpneumatic motor suitable for use with pneumatic piano players.

Another object of my invention is to provide valve guides of improvedconstruction for such a motor.

These and other objects of my invent on will be made apparent in thefollowing specification and claims, taken in connection with theaccompanying drawings. In these drawings I have illustrated one specificembodiment of my invention, and I will now proceed to describe the same.

It will be understood that the invention is defined in the appendedclaims.

Referring to the drawings Figure 1 1s a perspective view showing myimprovement. Figs. 2 and 3 are perspective vlews of a valve and aguidetherefor. Fig. 4 1s a vertical sectional view of the motor. Figs. 5and 6 are horizontal sectional views of the motor on lines 5 and 6 ofFig. 4.

My improved pneumatic motor comprises three pairs of oppositely actingbellows. The front fixed member of each bellows is designated 15 in thedrawings, and the back oscillating member is 16. The oscillating members16 are pivoted along a transverse axis 17, and the flexible material 13extends across and incloses the individualbellows. A moderate vacuum ismaintained by the main bellows of the blowernot shown in the drawingsandthis vacuum is transmitted through the tube 19 to the conduit or chamber30 that extends across in the fixed members 15. The lower end of eachoscillating member has a lug 20, to which is pivoted one end of a link21, the other end of each link engaging theoranked portion 22 of theshaft 23. The three cranks 22 are set 120 apart. Each link 21 has anoffset 24 near its crank end, to which is pivoted one end of a link 25,the other end of said link being pivoted to the lugs 26 on the D-slide32. Each fixed member 15 has a front face plate or slide plate 31,against which the slide valve 32 lies. The opposed sliding surface maybe lubricated with graphite. The upper bellows of each pair of bellowsopens through ports 27 on the front plate 31,and the lower bellows'ofeach pair opens similarly through ports 28. Also, thevacuum conduit 30opens on the front plate 31. by ports 29, between the ports 27 and 28.'Ihe D-slide valve 32 has a recess 33 adapted when the valve 32 is atone'end of its travel to connect the ports 29 with either set of ports27 or 28. The slide valve has a longitudinally extending groove 34 onits outer face, and the guide rod 35 lies in that groove. The ends ofthe guide rod 35 are fixed in the respective member 15, as indicated at36. Within the D-valve there is a longitudinal rib 37 to accommodate theexternal groove 34.. The shaft 23 drives a sprocket wheel 38, which, inturn, drives a chain39, and through it drives the mechanism intended tobe drivenfor example, the feed roll of a pneumatic player piano.

sition of its travel, it connects theports 28 and 29, so that the vacuumin the tube 19 draws air from the lower bellows through ports into thechamber 30. This collapses the lower bellows referred to and oscillates;the member 16, filling the upper bellows through the ports 27, which areopen to the external air. Since the cranks 22 are 120 apart, and sincethe action on the links 21 is double-acting, it will be seen that acontinuous rotation is given to the crank shaft 23.

The guiding mechanism for the D-slide valves 32 is simple, and easy toconstruct and assemble, easily permits inspection for repairs, and isrugged and serviceable.

Making the ports double, that is of two holes side-by-side, has theadvantage that it prevents the wood from curling or warping adjacent tothe ports, and thus prevents the edges of the ports from catching theedge of the slide valve.

I claim 1. In a pneumatic motor, a wall having. ports therethrough, aslide valve having its inner side fitting over said wall-and ports, saidvalve being provided with a longitudinal groove on its opposite side, aguide rod fitting in said groove having its ends projecting beyond saidvalve and attached to said wall, and engageable means carried by Whenthe D-valve 32 is at the lowermost po- 3 3. In a pneumatic motor, a wallwith ports therethrough, a slide valve over said ports,

said valve fitting against the wall around itsredges and being recessedwithin said edges, said valve also havinga longitudinal rib projectinginto said recess and having a longitudinal external groove registeringwith'said rib, and a fixed guide rod in said groove;

4:. In a pneumatic motor, a wall with ports therethrough, a slide valveover said ports, said valve having a longitudinal groove on its outerside, and a guide rod in said groove, said guide rod projecting each waybeyond the ends of the groove and the ends of the guide rod being turnedtoward said wall and fixed in holes in the face of said wall.

Copies of this patent may be obtained for five cents each, by addressingthe *Coinmiss'ionerot Patents,

. Washington, D. c.

